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    • 69. 发明授权
    • Fiber optic system with simultaneous switching and raman
    • 光纤系统同时切换和拉曼
    • US5946428A
    • 1999-08-31
    • US000359
    • 1998-01-29
    • Igor Vladimirovitch AleksandrovZinaida Vasylevna NestrovaDaniel Aloysius Nolan
    • Igor Vladimirovitch AleksandrovZinaida Vasylevna NestrovaDaniel Aloysius Nolan
    • G02F1/35H01S3/30H04B10/17H04B10/18G02B6/26H01S3/00
    • H04B10/2916G02F1/3515H01S3/302H04B10/25077G02F1/3511
    • A fiber optic system in accordance with the present invention includes an optical fiber, a coupling device, and a system for generating a pump signal. The optical fiber has a birefringence which preserves polarization and has a first polarization mode which is substantially perpendicular to a second polarization mode. The coupling device couples an input signal with an input wavelength into the optical fiber so that the input signal propagates in the first polarization mode in the optical fiber. The system for generating a pump signal generates a pump signal with a pump wavelength which is within a range of 50 nanometers (nm) to 300 nm less than the input wavelength and which has a first amount of pump power which is enough power to switch the input signal, but not enough to create higher order solitons. The coupling device also couples the pump signal into the optical fiber so that the pump signal propagates in the first polarization mode in the optical fiber. The pump signal induces a nonlinear birefringence in the optical fiber which causes the input signal to switch polarization modes and propagate in the second polarization mode, and amplifies the input signal propagating through the optical fiber. Accordingly, with the fiber optic system an input signal can be amplified and switched concurrently, and thus separate stages for amplification and switching are not required.
    • PCT No.PCT / US97 / 11699 Sec。 371日期1998年1月29日 102(e)日期1998年1月29日PCT 1997年7月1日PCT公布。 公开号WO98 / 01777 1998年1月15日,根据本发明的光纤系统包括光纤,耦合装置和用于产生泵浦信号的系统。 光纤具有保持极化的双折射,并且具有基本上垂直于第二偏振模式的第一偏振模式。 耦合装置将输入信号与输入波长耦合到光纤中,使得输入信号在光纤中以第一偏振模式传播。 用于产生泵浦信号的系统产生泵浦波长的泵浦信号,该泵浦波长在比输入波长小50纳米至300纳米的范围内,并且具有第一量的泵浦功率,其具有足够的功率来切换 输入信号,但不足以创建更高阶的孤子。 耦合装置还将泵浦信号耦合到光纤中,使得泵浦信号在光纤中以第一偏振模式传播。 泵浦信号在光纤中引起非线性双折射,其使输入信号切换偏振模式并以第二偏振模式传播,并放大通过光纤传播的输入信号。 因此,利用光纤系统,输入信号可以被同时放大和切换,因此不需要用于放大和切换的分离级。